CN102566843B

CN102566843B - The method for detecting of capacitive touch screen and capacitive touch screen

Info

Publication number: CN102566843B
Application number: CN201110402791.7A
Authority: CN
Inventors: 张钦富
Original assignee: Empia Technology Inc
Current assignee: Egalax Empia Technology Inc
Priority date: 2010-12-30
Filing date: 2011-11-30
Publication date: 2016-01-27
Anticipated expiration: 2031-11-30
Also published as: US8614688B2; TW201250565A; TWI430162B; US20150261360A1; CN102566843A; US8531426B2; US8502794B2; WO2012088753A1; EP2660688A1; CN102713806B; US20120169649A1; TWI430166B; US8614684B2; CN105549779B; CN105549779A; CN102541372B; EP2660688A4; US20120169652A1; US8614687B2; US9069411B2

Abstract

The invention provides a kind of capacitive touch screen, comprise the shielding construction and a busbar structure that mutually expose.Busbar structure comprises many first buss being provided a drive singal and many second buss providing mutual capacitance coupled signal, and shielding construction is provided a direct current signal.Shielding construction facilitate the contact range of each external conductive object to mutual capacitive multi-touch screen be greater than one pre-conditioned time, each external conductive object capacitive couplings is greater than capacitive couplings in the amount of the second bus or be greater than capacitive couplings in the amount of busbar structure in the amount of shielding construction, or each external conductive object capacitive couplings is greater than capacitive couplings in the amount of the second bus in the amount of shielding construction and the first bus, thus make drive singal after at least one first external conductive object outflow bus, be flowed into the ratio of the second bus again by least one second external conductive object, quantity along with the second external conductive object increases and reduces.

Description

The method for detecting of capacitive touch screen and capacitive touch screen

Technical field

The present invention relates to capacitive touch screen, particularly relate to a kind of method for detecting and the capacitive touch screen that reduce the capacitive touch screen of negative tactile impact.

Background technology

Please refer to shown in Figure 1A, when drive singal D is through a driven bus, by first of the same hand, signal I may refer to that A flows to the second finger B, cause in the process of scanning sensitive information SI, refer to that A and second refers to that the sensed bus of B all can sense mutual capacitance coupled signal and change corresponding to first, respectively as shown in touching associated sensed information SA and SB.Can be learnt by Figure 1A, the change lifting order wherein touching associated sensed information SA and SB is contrary, that is signal is contrary.

Touching associated sensed information SA representative refers to the sensed bus at A place corresponding to first and is driven the capacitively coupled change in bus intersection district to exist and just touch (realtouch).Similarly, touching associated sensed information SB representative refers to the sensed bus at B place corresponding to second and is driven the capacitively coupled change in bus intersection district, but, intersection district representated by touching associated sensed information SB is not touched, negative tactile (unrealtouch), i.e. terrible point (phantomtouch) are judged out by accident.In the following description, the signal flowing out bus because of the capacitive couplings of the first finger A is called just tactile signal, and the signal flowing into bus because of the capacitive couplings of second finger B is called negative tactile signal.Therefore detected by bus and change with the negative capacitive couplings touching signal the touching associated sensed information and the negative touching associated sensed information touched that are respectively and just touch corresponding to just touching signal.

Please refer to shown in Figure 1B, when first refers to that A and second refers to that B is positioned at close or identical sensed bus, touch associated sensed information SA and SB accordingly and cancel out each other because signal phase causes on the contrary, signal is diminished.When touch associated sensed information SA and SB intensity close to time, may signal gets too small be caused and cannot interpretation go out just tactile.In the following description, touch signal because of negative and just touching signal vicinity and causing the situation of the capacitive couplings variable quantity distortion of just touching detected to be called negative tactile effect.

In the above example, first refers to that A and second refers to that B insulate top layer and bus capacitive couplings across one, when insulation top layer is thinner, bears tactile effect larger.That is the capacitive couplings variable quantity distortion of just touching detected must be more serious.In addition, when causing the quantity of the negative second finger B touched more, the total amount of negative tactile signal is larger, and the capacitive couplings variable quantity distortion of just touching detected must be more serious, even the touching associated sensed information originally just touched is rendered as negative tactile touching associated sensed information.In other words, under worst-case conditions (worstcase), all second refers to that B and one first refers to that A is positioned at and identical detected bus (detectedelectrodestrips), and it is maximum for now bearing tactile effect.Apparently, when mutual capacitance type is detected, the negative tolerance touching effect is determined and whether correctly can detect the position of just touching and the quantity just touching position that can simultaneously detect.

Above-mentioned negative tactile effect is even more serious on portable apparatus, this is because the ground of portable apparatus system is different with the ground of human contact.Due to the demand in market, portable apparatus is required more and more thinner, and therefore be also required must be more and more thinner for capacitive touch screen.Capacitive touch screen is often configured in above display, the noise that display conduction comes can continuous interference capacitors formula touch-screen, the most direct method adds last layer screen layer (rearshieldinglayer at the back side (part near display) of capacitive touch screen, namely shield layer is carried on the back), screen layer loads an earthing potential, to isolate the noise that display conduction comes.But the increase of screen layer, must increase the thickness of capacitive touch screen, compares and is difficult to accord with the demands of the market.

Will when not increasing screen layer, reduce the interference of the noise that display conduction comes, the technological means the most often adopted is exactly at double-decker (DITO simultaneously; DoubleITO) in, the bus (driven bus) being provided drive singal is placed in lower floor, and sensed bus is placed in upper strata, wherein driven bus covers most display, except the bus being provided drive singal, all be provided earthing potential, produce the effect of similar screen layer.Because sensed bus is on upper strata, in order to reduce negative tactile effect, the thickness on insulation top layer just cannot be effectively thinning.When top layer of insulating uses glass material, sensed bus needs and needs to remain on about more than 1.1mm between finger.Even use plastic cement material to fit for the glass supported, sensed bus needs and needs to remain on about more than 0.7mm between finger.When the thickness on top layer of insulating has so strict restriction, just can only reduce by the thickness of the insulation intermediary layer driven between bus and sensed bus.

Relative to double-decker, single layer structure (SITO; SingleITO) also there is the thickness limits on same insulation top layer on insulation top layer, but due to the intermediary layer that do not insulate, integral thickness is thin relative to double-decker many, but is lost the effect of above-mentioned similar screen layer.If effectively cannot reduce the interference of the noise that display conduction comes, single layer structure is comparatively applicable to being arranged in display (Incell).If be placed in above display, the selection that screen layer just may necessitate.

The interference of the noise that display conduction comes reduces the ability of the position of judging just touching, and negative effects of touching judges many abilities just touching position.Apparently, the thickness of capacitive touch screen be reduced, may need to consider the distance between sensed bus needs and finger, even also consider the interference of the noise how anti-display conduction comes possibly.

As can be seen here, above-mentioned prior art obviously has inconvenience and defect, and pole waits to be further improved.In order to solve above-mentioned Problems existing, relevant manufactures there's no one who doesn't or isn't seeks solution painstakingly, but have no applicable design for a long time to be completed by development always, and common product and method do not have appropriate structure and method to solve the problem, this is obviously the anxious problem for solving of relevant dealer.Therefore how to found a kind of new technology, one of current important research and development problem of real genus, also becomes the target that current industry pole need be improved.

Summary of the invention

When carrying out multiple spot mutual capacitance type detecting (mutualcapacitivemulti-touchdetection) in mutual capacitance type multi-point touch screen (mutualcapacitivemulti-touchscreen), drive singal may by capacitive couplings through being circulated to the second finger with the first finger in palm, the signal for representing the position of just touching or change amount signal may being reduced, causing the erroneous judgement of just touching.The negative effect of touching of circulation between finger is the object of the invention is to reduce.

When carrying out multiple spot mutual capacitance type detecting (mutualcapacitivemulti-touchdetection) in capacitive touch screen (mutualcapacitivemulti-touchscreen), the capacitive couplings of the signal circulated between multiple external conductive object flows into mutual capacitance type multi-point touch screen and may cause the capacitive couplings variable quantity serious distortion just touched be detected, in order to avoid this problem, the thickness on insulation top layer cannot be effectively thinning.

Therefore, the object of the invention is to, busbar structure by capacitive touch screen impels and is driven the capacitive couplings of bus and external conductive object to be greater than by capacitive couplings detect bus and external conductive object, and reduction drive singal flows into by the ratio detecting bus after top layer of insulating is flowed out by the capacitive couplings of multiple external conductive object from bus again.Whereby, negative effect of touching can be lowered, and along with negative reduction of touching signal, the thickness on insulation top layer just can be thinner.

In addition, by adding the shielding construction being provided direct current signal at capacitive touch screen, mutually expose with busbar structure, shielding construction facilitate the contact range of each external conductive object to mutual capacitive multi-touch screen be greater than one pre-conditioned time, each external conductive object capacitive couplings is greater than capacitive couplings in the amount of the second bus or be greater than capacitive couplings in the amount of busbar structure in the amount of shielding construction, or each external conductive object capacitive couplings is greater than capacitive couplings in the amount of the second bus in the amount of shielding construction and the first bus, more effectively reduce drive singal to flow into again by the ratio of detecting bus after insulation top layer is flowed out by the capacitive couplings of multiple external conductive object from bus.

In addition, present in the mode of difference or two difference by by the capacitive couplings signal provided by detecting bus, effectively reduce the noise from behind display, save the setting of screen layer, the thickness of mutual capacitive multi-touch screen can be reduced further.Wherein, present in the mode of two difference by by the capacitive couplings signal provided by detecting bus, more can reduce the distorted signals problem because pressurized deformation causes simultaneously.

In a kind of mutual capacitive multi-touch screen that the present invention proposes, the structure of bus impel can be covered in by the contact range detecting effective touching of tram shielding construction expose area be greater than by detecting bus expose area or be greater than busbar structure expose area, or contact range is covered in shielding construction and is greater than is detected the area external conductive object of bus with driving the area that exposes of bus.Therefore at drive singal in time flowing into bus again after top layer of insulating is flowed out by the capacitive couplings of multiple external conductive object from bus, flow into and detected the signal of bus and can relatively reduce the impact of position detecting.

In the another kind of mutual capacitive multi-touch screen that the present invention proposes, be made to be driven the capacitive couplings of bus and external conductive object to be greater than by the capacitive couplings detecting bus by the distance of detecting bus apart from external conductive object to be comparatively greater than by the distance driving bus apart from external conductive object.Therefore at drive singal in time flowing into bus again after top layer of insulating is flowed out by the capacitive couplings of multiple external conductive object from bus, flow into and detected the signal of bus and can relatively reduce the impact of position detecting.

Apparently, in aforesaid mutual capacitive multi-touch screen, relative to by the bus detected, can be compared with close to external conductive object and the area exposed is comparatively large by driving bus, have both advantages concurrently.

The object of the invention to solve the technical problems realizes by the following technical solutions.The method for detecting of a kind of capacitive touch display proposed according to the present invention, comprise: a kind of method for detecting of capacitive touch screen, comprise: a capacitive touch screen is provided, this capacitive touch screen comprises: have the busbar structure comprising many buss mutually exposed, this busbar structure comprises: many first buss being operatively provided a drive singal when detecting for mutual capacitance type; With many second buss providing mutual capacitance coupled signal, the first described busbar structure mutually exposes with the second described busbar structure and is separated, and the overlapping one-tenth of wherein said bus exposes multiple grid exposing space; One shielding construction, comprises many screening conductive bars, and each screening conductive bar comprises multiple screening conductive sheets of many shielding connecting line series windings, and wherein each exposes space and exposes at least one screening conductive sheet; And provide this drive singal at least one first bus continuously, and provide a direct current signal to not being provided the first bus of this drive singal and described shielding construction simultaneously; And the mutual capacitance coupled signal provided according to the second described bus when this drive singal is provided each time produces a sensitive information.

The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.

The structure of aforesaid bus facilitate the contact range of each external conductive object to this capacitive touch screen be greater than one pre-conditioned time, each contact range be covered in this shielding construction expose area be greater than be covered in the second described bus expose area or be greater than be covered in described busbar structure expose area, or each contact range be covered in this shielding construction and the first described bus expose area be greater than be covered in the second described bus expose area, thus make the ratio of second bus of this drive singal after the first bus described at least one first external conductive object outflow in described external conductive object again described at least one second external conductive object in described external conductive object flows into, quantity along with the second described external conductive object increases and reduces.

It is adjacent at same layer with many underlying shield buss that aforesaid shielding construction comprises many upper strata screening conductive bars, the first wherein said bus is adjacent with described upper strata screening conductive bar, and the second described bus is adjacent at same layer with described underlying shield bus.

Aforesaid shielding construction comprises many screening conductive bars, one of the first described bus and the second described bus are adjacent at same layer with described screening conductive bar, and the first wherein said bus and the second described bus are separated in different layers with the intermediary layer that insulate.

Aforesaid shielding construction and the first described bus are positioned at same layer, the second wherein said bus and the first described bus are positioned at same layer or are positioned at and to insulate top layer one deck far away apart from one, and wherein said external conductive object is near to or in contact with in this insulation top layer.

The capacitive couplings of each external conductive object aforesaid and the second described bus is less than and the capacitive couplings of this shielding construction or the capacitive couplings that is less than with this shielding construction and the first described bus.

Aforesaid pre-conditioned be a width or an area, and the area that the first described bus exposes is greater than the area that the second described bus exposes.

The ratio being provided the first bus of this direct current signal after the first bus described in aforesaid drive singal flows out by least one first external conductive object in described external conductive object again described at least one second external conductive object in described external conductive object flows into, the quantity along with the second described external conductive object increases and increases.

Each value of aforesaid sensitive information is respectively differing from of the signal of a pair second buss or is respectively the difference of signal difference of two pairs of buss in three buss, and the noise that described poor suppression one display conduction comes.

The surrounding of aforesaid capacitive touch screen is fixed in a display, the part that capacitive touch screen is not fixed in this display produces deformation with pressure, and wherein each value of this sensitive information produces according to the difference of the signal difference of front two buss in three buss and the signal difference of rear two buss respectively.

The object of the invention to solve the technical problems also realizes by the following technical solutions.According to a kind of capacitive touch screen that the present invention proposes, comprise: have the busbar structure comprising many buss mutually exposed, this busbar structure comprises: many first buss being operatively provided a drive singal when detecting for mutual capacitance type; With many second buss providing mutual capacitance coupled signal, the first described busbar structure mutually exposes with the second described busbar structure and is separated, and the overlapping one-tenth of wherein said bus exposes multiple grid exposing space; One shielding construction, comprises many screening conductive bars, and each screening conductive bar comprises multiple screening conductive sheets of many shielding connecting line series windings, and wherein each exposes space and exposes at least one screening conductive sheet, and this shielding construction is provided a direct current signal; And wherein, this direct current signal is provided by a controller, this controller provides this drive singal at least one this drive singal of first bus continuously simultaneously, and provide this direct current signal to the first bus not being provided this drive singal, the mutual capacitance coupled signal that wherein this controller provides according to the second described bus when this drive singal is provided each time produces a sensitive information.

By technique scheme, the method for detecting of capacitive touch screen of the present invention and capacitive touch screen at least have following advantages and beneficial effect: relative to being supplied to external conductive object that signal flows out to bus in prior art, more negative to touch effect larger, in disclosed technical scheme, being supplied to external conductive object that signal flows out to bus, more negative to touch effect less, in contrast to the prior art.Also represent that to touch the tolerance of effect for void higher, the thickness on insulation top layer also can be thinner.

In addition, shielding construction to expose area larger, anti-also stronger from the ability of the noise of external conductive object.

Accompanying drawing explanation

Figure 1A and Figure 1B is the negative schematic diagram touching effect in prior art;

Fig. 1 C and Fig. 1 D is the schematic diagram of a position detection system;

Fig. 1 E to Fig. 1 H is the structural representation of sensed layer;

Fig. 2 A and Fig. 2 B is the empty analysis schematic diagram touching effect;

Fig. 3 A and Fig. 3 B is the schematic diagram of the ostiolate busbar structure that the foundation first embodiment of the present invention proposes;

Fig. 4 A and Fig. 4 B is the schematic diagram of the continuous difference of tool and the sensitive information of the continuous pair difference of tool proposed according to the present invention;

The schematic flow sheet of the method for detecting of the capacitive touch display that Fig. 5 provides for the foundation second embodiment of the present invention;

Fig. 6 touches effect analysis schematic diagram according to the void on the capacitive touch screen of tool shielding construction of the present invention

Fig. 7 A is the shielding construction schematic diagram proposed according to the third embodiment of the present invention;

Fig. 7 B is the shielding construction schematic diagram proposed according to the fourth embodiment of the present invention;

Fig. 7 C is the shielding construction schematic diagram proposed according to the fifth embodiment of the present invention;

Fig. 7 D is the shielding construction schematic diagram proposed according to the sixth embodiment of the present invention;

Fig. 7 E is the shielding construction schematic diagram proposed according to the seventh embodiment of the present invention;

Fig. 8 is the method for detecting of the capacitive touch screen according to eighth embodiment of the present invention proposition;

Fig. 9 A to Fig. 9 C is the structure of a kind of capacitive touch screen according to ninth embodiment of the present invention proposition; And

Figure 10 A to Figure 10 E is the structure of a kind of capacitive touch screen according to tenth embodiment of the present invention proposition.

[main element symbol description]

Embodiment

For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to the embodiment of the method for detecting of capacitive touch screen proposed according to the present invention and capacitive touch screen, step, structure, feature and effect thereof, be described in detail as follows.

Summary of the invention of the present invention can be understood for providing clearer description and making to be familiar with this those skilled in the art, in diagram, each several part is not drawn according to its relative size, the ratio regular meeting of some size and other scale dependents is seemed by highlighting and exaggerates, and incoherent detail section is not also drawn completely, in the hope of succinctly illustrated.

Please refer to Fig. 1 C, the present invention proposes a kind of position detecting apparatus 100, comprises a sensing apparatus 120, drives/detecting unit 130 with one.Sensing apparatus 120 has a sensed layer.In one example of the present invention, one first sensed layer 120A and one second sensed layer 120B can be comprised, first sensed layer 120A and the second sensed layer 120B has multiple bus 140 respectively, and wherein multiple second bus 140B of multiple first bus 140A and the second sensed layer 120B of the first sensed layer 120A are overlapping.In another example of the present invention, multiple first bus 140A and the second bus 140B can be configured in coplanar sensed layer.Driving/detecting unit 130 produces a sensitive information according to the signal of multiple bus 140.Such as when self-capacitance is detected, be the driven bus 140 of detecting, and when mutual capacitance type is detected, detecting be there is no driven part bus 140.In addition, sensing apparatus 120 can be configure on display 110, and between sensing apparatus 120 and display 110 can be has configuration one screen layer (shieldinglayer) (not showing in illustrating) or do not configure screen layer.In a preferable example of the present invention, in order to make the thickness of sensing apparatus 120 thinner, between sensing apparatus 120 and display 110, do not configure screen layer.

Aforementioned first bus and the second bus can be many row buss and row bus that arrange with row or column, can also be many first dimension buss and the second dimension bus that arrange with the first dimension and the second dimension, or many first axle buss arranged along the first axle and the second axle and the second axle bus.In addition, aforementioned first bus and the second bus can be with orthogonal overlapping to each other, can also be with nonopiate overlapping.Such as in a rho theta system, one of described first bus or the second bus can be radial arrangement, and another of described first bus or the second bus can be annular arrangement.Moreover one of described first bus or the second bus can be driving bus, and another of described first bus or the second bus can be detecting bus.Described " the first dimension " and " the second dimension ", " the first axle " and " the second axle ", " driving " and " detecting ", " by driving " and " by detecting " bus all can be used to represent aforesaid " first " and " second " bus, including but not limited to form orthogonal grid (orthogonalgrids), can also be form the geometry framework (geometricconfigurations) that other have the first dimension and the second dimension overlapping (intersecting) bus.

Position detecting apparatus 100 of the present invention can be applied in a computer system, an example as shown in figure ip, comprises controller 160 and a main frame 170.Controller 160 comprises driving/detecting unit 130, with operatively coupled sense device 120 (not showing in diagram).In addition, controller 160 can comprise a processor 161, and control driving/detecting unit 130 and produce sensitive information, sensitive information can be stored in storage medium 162, accesses for processor 161.In addition, main frame 170 forms the main body of computing system, mainly comprises a CPU (central processing unit) 171, and for the storage element 173 that CPU (central processing unit) 171 accesses, and the display 110 of display operation result.

In another example of the present invention, a transmission interface is comprised between controller 160 and main frame 170, control module transmits data to main frame by transmission interface, and those skilled in the art can know transmission interface by inference and include but not limited to the various wired or wireless transmission interface such as UART, USB, I2C, Bluetooth, WiFi, IR.In one of the present invention example, the data of transmission can be position (as coordinate), identification result (as gesture code), order, sensitive information or the available information of other controllers 160.

In one example of the present invention, sensitive information can be control produced initial sensitive information (initialsensinginformation) by processor 161, main frame 170 is transferred to carry out position analysis, such as position analysis, gesture judgement, order identification etc.In another example of the present invention, sensitive information can be first analyzed by processor 161, then the position judged, gesture, order etc. are submitted to main frame 170.The present invention includes but be not limited to aforesaid example, those skilled in the art can know the interaction between other controller 160 and main frames 170 by inference.

In the crossover region of each bus, upper with under bus form the two poles of the earth.Each crossover region can be considered the pixel (pixel) in an image (image), when have one or more external conductive object close to or touching time, described image can be considered the image (as pointed the structure (pattern) touched in sensing apparatus) photographing touching.

When one is provided a drive singal by driving bus, formed a self-capacitance (selfcapacitance) by driving bus itself, and formed a mutual capacitance (mutualcapacitance) by each crossover region driven on bus.The detecting of aforesaid self-capacitance is the self-capacitance detecting all buss, be specially adapted to judge single external conductive object near to or in contact with.

Aforesaid mutual capacitance type detecting, when one is provided a drive singal by driving bus, by with detected the electric capacity or capacitance change that drive all crossover regions on bus by all sensed bus driving bus different dimensions to arrange, to be considered as the row pixel in image.Accordingly, namely the pixel collecting all row forms described image.When have one or more external conductive object close to or touching time, described image can be considered the image photographing touching, be specially adapted to judge multiple external conductive object near to or in contact with.

Please refer to shown in Fig. 1 E, is a kind of structure (pattern) of capacitor-type touch sensor, comprises multiple conducting strip (conductiveplate) and many connecting lines.These connecting lines comprise many first connecting lines and many second connecting lines.These first connecting lines are with first direction (as one of transverse direction or longitudinal direction) configuration, connect the some of these conducting strips, to form many buss towards first direction arrangement.Similarly, these second connecting lines be with second direction (as laterally or another of longitudinal direction) configuration, connect another part of these conducting strips, to form many buss arranged towards second direction.

These buss (the first bus and the second bus) can be made up of transparent or opaque material, such as, can be to be made up of transparent tin indium oxide (ITO).Structurally can be divided into single layer structure (SITO; SingleITO) with double-decker (DITO; DoubleITO).The ordinary person of the art can know the material of other buss by inference, is repeating no more.Such as, CNT.

In example of the present invention, be using longitudinally as first direction, and using laterally as second direction, therefore longitudinal bus is the first bus, and the bus of transverse direction is the second bus.Those skilled in the art can know one of above-mentioned example being illustrated as invention by inference, are not used for limiting the present invention.Such as, can be using laterally as first direction, and using longitudinally as second direction.

Fig. 1 F is the sectional view at I place in Fig. 1 E, comprises dielectric base 17 (substrate), the some (containing conducting strip 11, second connecting line 12, conducting strip 13) of the second bus, insulation course 18, some (containing the first connecting line 15) and insulation top layer 19 with the first bus.In one example of the present invention, substrate 17, insulation course 18 are formed with transparent or opaque material with insulation top layer 19, as glass or plastic film (film), those skilled in the art can know other constituted modes of this example by inference, do not repeat them here.

In one example of the present invention, Fig. 1 G is the sectional view at II place in Fig. 1 E, for a kind of structural representation of double-layer capacitance type touch sensor, comprise dielectric base 17 (substrate), the some (containing the second connecting line 12) of the second bus, insulation course 18, some (containing conducting strip 14, first connecting line 15, conducting strip 16) and insulation top layer 19 with the first bus.

In one example of the present invention, Fig. 1 H is the sectional view at I place in Fig. 1 E, for a kind of structural representation of individual layer capacitor-type touch sensor, comprise dielectric base 17 (substrate), the some (containing the second connecting line 12) of the second bus, insulation course 18, some (containing conducting strip 14, first connecting line 15, conducting strip 16) and insulation top layer 19 with the first bus.Second connecting line 12 of conducting strip 14,15 and second bus of the first bus is copline, and the first connecting line 15 strides across the second connecting line 12 in the mode of building bridge, and is wherein completely cut off by insulation course 18 between the first connecting line 15 and the second connecting line 12.Those skilled in the art can know other bridge formation mode by inference, do not repeat them here.Such as relative to the upwards bridge formation mode of this example, it can be mode of building bridge downwards.

Please refer to Figure 1A, what touching associated sensed information SA presented is the change that the first finger A is coupled with by the mutual capacitance driven between bus, sensed bus, and what touch that associated sensed information SB presents is the change that the second finger B is coupled with the mutual capacitance between sensed bus.

Due to close while that first of same palm referring to that A and second refers to B or when touching sensed bus, the signal just touched may be reduced by the opposite signal of circulation between referring to, as shown in Figure 1B, the most direct mode addressed this is that is that the signal that will be circulated to sensed bus between referring to reduces.Based on capacitively coupled degree be:

C = &Element; \frac{A}{d};

Meaning and capacitively coupled degree C are directly proportional to capacitively coupled area A, and capacitively coupled distance d is inversely proportional to.

Owing to insulate top layer across one deck between finger and sensed bus, one of mode therefore reduced by the signal being circulated to sensed bus between referring to is by the thickness increase of insulation top layer insulation meter layer.In one example of the present invention, insulation top layer can be skin glass, and suitable thickness is 1.1mm or more than 1.0mm.

But, because portable apparatus is more and more emphasized frivolous, the thickness of skin glass is also required more and more thinner, in one example of the present invention, the insulation top layer insulation meter layer thickness be required may at below 0.7mm, therefore, in one example of the present invention, another of the mode reduced by the signal being circulated to sensed bus between referring to is reduced by the area that exposes of sensed bus.

Please refer to Fig. 2 A, first finger and the second finger of human body touch the first contact region P1 and the second contact region P2 of capacitive touch screen, first contact region P1 covers the crossover region of the first bus Tx1 and the second bus Rx1, and the second contact region P2 covers the crossover region of the first bus Tx2 and the second bus Rx2.When the first bus Tx1 is provided a drive singal SD, all the other first buss comprising the first bus Tx2 are provided direct current signal, and each second bus is detected respectively.In one example of the present invention, can be not yet be provided direct current signal by the second bus detected.Described direct current signal can be provided by the circuit of grounding circuit or maintenance direct current signal, and therefore, in the present invention, the circuit being coupled in grounding circuit or direct current signal can be provided direct current signal, as the circuit be grounded or the bus be grounded.In like manner, being coupled in and providing the circuit of drive singal can be considered as being provided drive singal, is driven circuit, as driven bus.In addition, drive singal SD is provided to many first buss simultaneously, in a preferable example of the present invention, can be many adjacent buss, as two or three bus.The bus of driving part simultaneously, (reinforcements) can be controlled by by the signal that detects of detecting bus by adaptability ground (adaptively), and can reduce when self-capacitance is detected because being attached to the impact that insulate aqueous vapor on top layer or conducting particles cause.

In the example shown, when drive singal SD is provided to the first bus Tx1, contact the finger of the first contact region P1 for just tactile, and when drive singal SD is provided to the first bus Tx2, contact the finger of the second contact region P2 for just tactile.Similarly, the negative finger touched is caused also can be provided to the first different buss with drive singal SD and to change.For convenience of description, in the following description, using the finger just touched as the first finger, the negative finger touching effect is caused to be second finger.

Accordingly, be relevant to the first contact region P1 part, the capacitive couplings amount of formation comprises: the capacitive couplings amount Ctr1 between the first bus Tx1 and the second bus Rx1, the first bus Tx1 and first capacitive couplings amount Cht1, the second bus Rx1 and first pointed between H1 points the capacitive couplings amount Chr1 between H1.Similarly, be relevant to the second contact region P2 part, the capacitive couplings amount of formation comprises: the capacitive couplings amount Cht2 between the capacitive couplings amount Ctr2 between the first bus Tx2 and the second bus Rx2, the first bus Tx2 and second finger H2, the capacitive couplings amount Chr2 between the second bus Rx2 and second finger H2.

In addition, remain the capacitive couplings amount Chg between health and device be connected with second finger H2 at the first finger H1, this value is generally between 10Pf to 250pF, and the signal wherein flowed through is Sg.

Therefore, when drive singal SD is provided to the one or more the first bus Tx1, by the signal of each the second bus of detecting, can represent or obtain the signal being stacked district that each second bus and the first bus Tx1 are stacked or change amount signal (change amount signal relative to signal when not being touched).In like manner, by providing drive singal SD to other the first buss, can represent or obtaining all signal or the change amount signal that are stacked district.Such as, by the second bus Rx1 and Rx2 sensing signal Sr1 and Sr2 respectively, the capacitively coupled amount in district that is stacked can be represented, and compare with the capacitively coupled amount be stacked when district is not touched, can change amount signal be obtained.Therefore, when there being external conductive object (as finger) contact, the capacitively coupled amount in district can be stacked by these or variable quantity represents the position be touched.Although capacitive couplings is in first bus and second bus respectively for the first finger H1 and second finger H2 in diagram, those skilled in the art can know by inference, and each finger can be that capacitive couplings is in many buss.

While drive singal SD not merely flows out with signal Sr1, likely flowing out to external conductive object from bus becomes signal S1, as flowed out to the first finger H1 by bus with capacitive couplings.Signal S1 all or some become signal Sg is flow to ground or system with capacitive couplings ground by external conductive object, wherein the some of signal S1 may become signal S2 and flows through external conductive object and flow to bus with capacitive couplings, and such as flowing to the second bus becomes signal Sr2 or flow to the first bus being provided direct current signal.

Therefore not only can detect the capacitively coupled change being stacked district representing the first bus Tx1 and the second bus Rx1 and be stacked, also can detect the capacitively coupled change being stacked district representing the first bus Tx1 and the second bus Rx2 and be stacked.Because being stacked of being stacked of the first bus Tx1 and the second bus Rx2 district does not exist actual capacitive couplings, but but indicates capacitively coupled change by the signal detected, form non-existent negative tactile.Again because signal flows to second finger H2 by the first finger H1, the signal that second bus Rx1 and Rx2 is detected presents contrary situation, when the signal Sr1 of the actual contact that the second bus Rx1 detects is regarded as the signal just touched, then the second bus Rx2 detects the false signal Sr2 contacted and can be considered as the negative signal touched.If the first contact region P1 second bus corresponding with the second contact region P2 close to or the first contact region P1 and the second contact region P2 extends to identical second bus time, just touching and can cause the situation of cancelling out each other with the negative signal touched, likely making the signal gets too small just touched and cannot be detected.When the negative quantity touched is more, this situation is obvious, even likely the signal cancellation just touched is become the negative signal touched.With impedance/electrovolumetric analysis, be Chg+Cht2 (when being provided drive singal because of the first bus Tx1, the first bus Tx2 is provided direct current signal (as ground connection)) at the electric capacity of the second contact region P2 to the circuit being provided direct current signal, the electric capacity of the negative signal that touches and the second bus Rx2 is Chr2.Therefore negative ratio GTR=(Chr2)/(Chg+Cht2) touching and just touching.The negative tactile ratio GTR with just touching is less, bears the effect touched signal and just touch signal cancellation less.Remove or reduce the negative signal that touches and align tactile caused impact, adjustable is provided the area of the circuit of direct current signal, make second finger H2 near to or in contact with time, most contact range all cover be provided direct current signal circuit (as not being provided the first bus of drive singal) on.

Solve and cause because just touching and bear tactile signal cancellation the method just touched and judge by accident, will bear as much as possible to touch signal reduction, the most direct way is exactly the distance that will strengthen between external conductive object and the second bus, as strengthened the distance between second finger H2 and the second bus Rx2.In one example of the present invention, when insulation top layer is glass and the about 1.1mm of distance between second finger H2 and the second bus Rx2, the single problem with the single negative signal cancellation touched of just touching effectively can be solved.But, when problems faced is single just touching with multiple negative tactile signal cancellation, may the distance between finger and the second bus be added to larger.Apparently, can tolerate and just touch and bear tactile signal cancellation and the limited ability just touching and judge by accident position can not be caused in the distance pointed and between the second bus, such distance is difficult to be less than 0.7mm.Therefore, the negative signal that touches be reduced as far as possible, just the distance between finger and the second bus must be strengthened as far as possible.But, this and market wish that the demand that capacitive touch screen is more and more thinner runs in the opposite direction.

Can be learnt with the ratio GTR just touched by negative touching proposed by the invention, GTR=(Chr2)/(Chg+Cht2), reduce and just touch and the impact of the negative signal cancellation touched (touching effect hereinafter referred to as negative), need the capacitive couplings amount Chr2 between the second bus and finger to reduce, and/or finger and the capacitive couplings amount (Chg+Cht2) be coupled between direct current signal circuit are increased.

Accordingly, in one example of the present invention, many first buss of a busbar structure and many second buss mutually overlapping and mutually expose, and the area that the first described bus exposes is greater than the area that the second described bus exposes.In another example of the present invention, outside shaping claviform near to or in contact with the capacitive couplings scope of an effective contact be large enough to be judged out a position time, busbar structure makes to cover in capacitive couplings scope or capacitive couplings is greater than in the area that the first bus exposes the area that covering or capacitive couplings expose in the second bus.The area that such as the second bus exposes is less than the half of the area that the first bus exposes, and capacitive couplings scope is greater than the area of each crossover region.When the first bus and the second bus are covered with or convergence is covered with an active region (activearea) of capacitive touch screen, such busbar structure impel the capacitive couplings scope of any effective contact across multiple crossover region cover or capacitive couplings in the area that the first bus exposes be greater than the area that exposes in the second bus of covering or capacitive couplings.

Aforesaid external conductive object be contact range be greater than one pre-conditioned time cause effective touching, wherein effectively touching can facilitate the signal or change amount signal that are enough to judge position, and preset range can be width (length), area etc.Maximum or the minimum widith of such as contact range is greater than pre-conditioned or area and is greater than pre-conditioned.Therefore, in single layer structure, the capacitive couplings amount that the capacitive couplings amount of second finger H2 and the second bus will be less than and between direct current signal.

In addition, in double-decker, the first bus is positioned at upper strata, and the second bus is positioned at lower floor, that is the first bus is positioned at comparatively close to one deck of external conductive object.Therefore, be greater than pre-conditioned in the contact range of any external conductive object to this capacitive touch screen and form effectively touching, and the area that contact range covers the first bus is greater than contact range when covering the area of the second bus, the capacitive couplings amount that the capacitive couplings amount of second finger H2 and the second bus will be less than and between direct current signal circuit.

In the prior art, the capacitive couplings amount of second finger H2 and the second bus of not guaranteeing be less than and capacitive couplings amount between direct current signal circuit when, the quantity of second finger H2 is more, and the signal that the capacitive couplings pointing H2 and the second bus by two flows into the second bus is more.

Please refer to Fig. 2 B, is bear to touch the schematic diagram that signal S2 flows into bus, and the impedance R in diagram represents the impedance before negative tactile signal S2 inflow bus.Because drive singal capacitive couplings in the first finger H1 signal can via second finger H2 formed with the capacitive couplings Cr of the second bus and with the capacitive couplings Cg of circuit (as not being provided the first bus of drive singal) being provided direct current signal, and form the signal Ig that the signal Ir that flows in the second bus and inflow are provided the circuit of direct current signal respectively.Apparently, drive singal is at capacitive couplings circuit flowing into the second bus and be provided direct current signal in parallel after the first finger H1, and when second finger H2 increases, relatively the amount of capacitive couplings Cr and Cg also can increase.If the amount that capacitive couplings Cr increases is greater than the amount that capacitive couplings Cg increases, because resistance and electric capacity are inversely proportional to, signal Ir will increase, and signal Ig will reduce, that is negative effect of touching increases.

Therefore, along with causing, the quantity of the negative second finger H2 touched is more, and the distance between the second bus and second finger H2 also must be larger, as insulation top layer needs thicker, could tolerate negative impact of touching effect, the unlikely erroneous judgement causing the position of just touching.But it is contrary that insulation top layer thickeies the target thinning with capacitive touch screen.

Accordingly, it is adopt a kind of busbar structure that the present invention reduces the negative technological means touching effect, the contact range of effectively touching be greater than pre-conditioned under, the design of busbar structure be based on any be greater than pre-conditioned contact range cover the first bus expose that area must be greater than covering second bus expose area.Therefore when the quantity of second finger H2 increases, the amount that capacitive couplings Cg increases is greater than the amount that capacitive couplings Cr increases, and because resistance and electric capacity are inversely proportional to, signal Ig will increase, and signal Ir will reduce, that is negative effect of touching reduces.

Under the pattern of the best of the present invention, the first bus is positioned at double-deck upper strata, and the second bus is positioned at double-deck lower floor.Such as shown in Fig. 3, the gabarit that first bus on upper strata and the second bus of lower floor expose is suitable, but the second bus comprises multiple opening, and the area that therefore the first bus exposes is greater than the area that the second bus exposes.

The design of described opening and size make drive singal capacitive couplings be less than the amount of the circuit being provided direct current signal in the signal of at least one external conductive object to flow into the second bus amount via the capacitive couplings of other external conductive objects.In other words, when aforementioned second finger H2 increases, drive singal capacitive couplings is less than the capacitive couplings recruitment with the circuit being provided direct current signal in the signal of at least one external conductive object and the capacitive couplings recruitment of the second bus, the ratio making negative tactile signal S2 flow into the second bus jointly reduces, and the negative signal S2 of touching flows into the ratio increase being provided the circuit of direct current signal.

In the present invention, under flowing out the identical condition of the semaphore of bus with capacitive couplings, the quantity of second finger H2 is more, and the signal being flowed into the second bus by the capacitive couplings of second finger H2 and the second bus is fewer.Under this condition, as long as the thickness on insulation top layer can tolerate the negative impact of touching that a second finger H2 causes, the negative impact of touching tolerating that more second finger H2 causes also is equal to.Above-mentioned tolerance bears tactile impact when referring to that have that one or more second finger H2 causes negative touches, and still the position that each is just touching correctly can be judged.

According to above-mentioned, when capacitive touch screen is opaque, such as, time as notebook computer touch-control indicator device (touchpad), sensed bus (as the second bus) is attenuated, also can reduce negative tactile effect.If but sensed bus is too sparse, when pointing oblique stroke of straight line, a succession of coordinate representing finger position may be the jagged oblique line of line, and the configuration of sensed bus is more sparse, and jagged degree is more serious.

In addition, when capacitive touch screen is transparent (when being such as covered in display formation touch-sensitive display (touchsensitivedisplay)), can try one's best evenly to allow penetrability, wire bar on capacitive touch screen needs the active region (activearea) be evenly covered with as much as possible on capacitive touch screen, such as, shown in Fig. 1 E.Although the conducting strip in diagram is rhombus, it can also be the polygon such as hexagon, octagon that those skilled in the art can know conducting strip by inference, or other geometric figures.

Please refer to Fig. 3 A, be a kind of capacitive touch screen provided according to the first embodiment of the present invention, there is a busbar structure 30, comprise many first buss 31 and the second buss 32, mutually expose and overlap on multiple crossover region.Wherein the first bus 31 is connected to form by multiple first conducting strip 33, and the second bus 32 is connected to form by multiple second conducting strip 34, and the second described conducting strip has multiple opening 35.

Each second conducting strip can be have one or more opening, and the area that the size (or area) of opening facilitates the touching scope being greater than one pre-conditioned one effective contact to be covered in the first described bus is greater than the area being covered in the second described bus.When described effective contact can refer to external conductive isoelectric membrane busbar structure, can correctly be judged the contact of position, along with conductive structure is different from the physical characteristics of external conductive object, pre-conditioned also thereupon different, wherein said physical characteristics can be resistance capacitance (RC) circuit characteristic.

Above-mentioned effective contact is greater than pre-conditioned and without any need for measurement, namely by the design of the structure of bus, when making contact range exceed specific width or specific area, what contact range covered the be provided circuit of direct current signal expose that area is greater than that contact range covers the second bus expose area.

Please refer to shown in Fig. 3 B, multiple plan conducting strip 36 can be comprised in described opening 36.Each opening can have one or more plan conducting strip, and it can be identical with the material of the second bus for intending conducting strip, or has same transparency and color, to maintain the consistance of the transparency of busbar structure 30 as much as possible.

In double-decker (DITO), the first bus is positioned at upper strata (one deck of closer external conductive object), and the second bus is positioned at lower floor's (one deck compared with away from external conductive object).In single layer structure (SITO), the first conducting strip and the second conducting strip are positioned at same layer, and many first connecting lines and many second connecting lines that connect the first conducting strip and the second conducting strip respectively overlap on multiple crossover region mutually.In a preferable example of the present invention, the first described connecting line of single layer structure strides across between the second described connecting line and insulation top layer.

Therefore, when the gabarit of the first bus and the second bus is covered with or is roughly covered with active region, the area that above-mentioned opening can reduce by the second bus is effectively set in the second bus, and maintain good precision, the zigzag degree that the coordinate reducing the oblique epoch-making table finger position of finger presents.In fact, can predict that point will the path of movement by the process of finger movement, revise jagged degree whereby, if but with the gabarit of bus active region be covered with or be roughly covered with, directly can reduce serrating degree on signal, make above-mentioned correction more accurate.In addition, in one example of the present invention, conducting strip catercorner length can be large about about 5.5mm, and those skilled in the art can know other applicable sizes of conducting strip by inference, the present invention includes but be not limited to above-mentioned catercorner length.

Except above-mentioned reduce by the second bus at the second bus with multiple opening expose except area, also can be that the live width of the second bus is reduced, in brief, it is the area that the area allowing the first bus expose is greater than the second bus, or when contact range is greater than pre-conditioned (as being greater than a width or an area), contact range cover the first bus expose that area is greater than covering second bus expose area.Such as, when contact range is across multiple crossover region, contact range major part covers on the first bus of exposing.

Accordingly, the present invention be by the structure (pattern) of bus or aforesaid opening facilitate the contact range of each external conductive object to this capacitive touch screen be greater than one pre-conditioned time, the capacitive couplings of each external conductive object and the first described bus is greater than the capacitive couplings with the second described bus, thus make the ratio of second bus of this drive singal after the bus described at least one first external conductive object outflow in described external conductive object again described at least one second external conductive object in described external conductive object flows into, quantity along with the second described external conductive object increases and reduces.

In addition, the first bus not being provided this drive singal is provided a direct current signal, and the ratio of the circuit (as the first bus) being provided this direct current signal after the bus described in this drive singal flows out by least one first external conductive object in described external conductive object again described at least one second external conductive object in described external conductive object flows into, the quantity along with the second described external conductive object increases and increases.

Those skilled in the art can know by inference, and the opening 32 in Fig. 3 A includes but not limited to rhombus with the shape intending conducting strip 33, can be any geometric configuration.In one example of the present invention, intending conducting strip can be same material with conducting strip.

Capacitive touch screen more can be combined into capacitive touch display (capacitivetouchsensitivedisplay) with display.In a preferable example of the present invention, between the bus of capacitive touch screen and display, there is not the screen layer (rearshieldinglayer) being provided direct current signal.Traditional screen layer is provided earthing potential, between bus and display, maintains earthing potential, stops that the noise of display conduction is to bus.

If lacked screen layer, the thickness of capacitance type touch control screen can be reduced significantly, but the interference that the noise that effectively must solve display conduction causes.Accordingly, the present invention is that the mutual capacitance coupled signal taking control circuit to provide according to the second bus produces a sensitive information, by subtracting each other of signal between bus, suppresses common mode to make an uproar news (commonmodenoise).

In one example of the present invention, be that the mutual capacitance coupled signal provided according to the second bus produces continuous multiple difference, each value is respectively the difference of pair of conductive bar (as the second bus) signal.Such as n bus produces n-1 difference, and each difference is the difference of the signal of a bus and last bar bus respectively.The noise of the display conduction be subject to due to adjacent bus is close, and the result of the signal subtraction of therefore adjacent pair of conductive bar can remove most noise effectively.In other words, above-mentioned difference inhibits display to conduct the noise of coming.

In another example of the present invention, be that the mutual capacitance coupled signal provided according to the second bus produces continuous multiple pairs of differences, each value is respectively the difference of the signal difference of two pairs of buss in three buss.Such as n bus produces n-2 two difference, and each two difference is the difference of the signal difference of the last signal difference to bus and rear pair of conductive bar respectively.The noise of the display conduction be subject to due to adjacent bus is close, and the result of the signal subtraction of therefore adjacent pair of conductive bar can remove most noise effectively.

In an example in the present invention, can there is the screen layer of the direct current signal that is coupled between capacitive touch screen with display, just relative to not having the capacitive touch screen of screen layer, overall thickness is larger.

But, during the deformation of capacitive touch screen pressurized, each bus can because and distance between display change, the noise be subject to also can be changed.Such as capacitive touch screen only has periphery to be fixed on display, and the part not being fixed on display may pressurized and deformation.Because the degree of deformation between adjacent bus is close, in three buss, the change of the last noise to causing because of deformation between bus and between rear pair of conductive bar is also close, the signal difference of the last signal difference to bus and rear pair of conductive bar is subtracted each other the change of the noise can effectively going most deformation to cause.In other words, two difference can suppress display to conduct the noise of coming effectively, and the change of the noise that deformation can be suppressed to cause.

Described difference can be detect partly one by one or simultaneously or after the signal of whole second bus, first convert digital date to by anaiog signal, then produce sensitive information by digital date.Also can be in the process of the signal of detecting part or whole second bus or produce the anaiog signal of difference after process with subtraction circuit (as differential amplifier), then convert digital date to produce sensitive information.

Above-mentioned continuous difference with continuous two difference, relative to external conductive object near to or in contact with part can present one or more zero confluce, on the occasion of between negative value, just present zero confluce at each.Please refer to Fig. 4 A, it is the schematic diagram of the sensitive information comprising continuous difference, a corresponding external conductive object near to or in contact with part present one zero confluces 41, this zero confluce 41, corresponding to the position of external conductive object, can calculate position or the coordinate of zero confluce 41 by the slope on the occasion of between negative value of zero both sides, confluce 41.Please refer to Fig. 4 B again, it is the schematic diagram of the sensitive information comprising continuously two difference, a corresponding external conductive object near to or in contact with part present a pair zero confluces, this is to the position of the peak 42 between zero confluce corresponding to external conductive object, the position at peak 42 can be calculated by the value of scanning both sides, peak 42, such as, calculate centroid position with the value of both sides, peak 42.

In the process of mutual capacitance type detecting, the image corresponding to above-mentioned crossover region can be scanned corresponding to crossover region array.Such as Fig. 4 A and Fig. 4 B are that the two-dimensions sensitive information gathered corresponding to a dimension sensitive information of the crossover region on each the first bus just becomes an image corresponding to the dimension sensitive information on single first bus.

In one example of the present invention, be record an initial image before capacitive touch screen is not touched, afterwards by the image scanned and initial image comparison at every turn to judge the position of each external conductive position part.Such as, each value corresponding between the image at every turn scanned to initial image subtracts each other the difference image produced, then judges the position of each external conductive object according to the change in difference image.

Please refer to Fig. 5, is the schematic flow sheet of the method for detecting of the capacitive touch display according to second embodiment of the present invention proposition.First, as illustrated in diagram 510, provide and do not have a capacitive touch display of screen layer, capacitive touch display comprises many buss and a display that mutually expose.Described bus comprises and to be operatively provided many first buss of a drive singal when detecting for mutual capacitance type and to provide many second buss of mutual capacitance coupled signal, separated from one another between bus.In addition, there is not the screen layer being provided a direct current signal between display and described bus.The structure of described bus facilitate the contact range of each external conductive object to capacitive touch screen be greater than one pre-conditioned time, the capacitive couplings of each external conductive object and the first described bus is greater than the capacitive couplings with the second described bus, thus make the ratio of second bus of drive singal after the bus described at least one first external conductive object outflow in described external conductive object again described at least one second external conductive object in described external conductive object flows into, quantity along with the second described external conductive object increases and reduces.

In addition, the first bus not being provided this drive singal is provided direct current signal, and the ratio of the circuit (as the first bus) being provided direct current signal after the bus described in drive singal flows out by least one first external conductive object in described external conductive object again described at least one second external conductive object in described external conductive object flows into, the quantity along with the second described external conductive object increases and increases.

Next, as indicated in step 520, provide a drive singal at least one first bus continuously simultaneously.Such as provide drive singal at least one first bus by above-mentioned driving/detecting unit 130, once can be supplied to first bus, adjacent two or three first bus can also be supplied to simultaneously.

In addition, as shown in step 530, the mutual capacitance coupled signal provided according to the second described bus when each drive singal is provided produces a sensitive information, wherein each value of this sensitive information is respectively the difference of the signal difference of two pairs of buss in the difference of the signal of a pair second buss or three buss, and the noise that described difference suppresses the conduction of this display.

The correlative detail of the present embodiment has been disclosed in aforementioned explanation, does not repeat them here.

The present invention more comprises a shielding construction (guardingpattern), have conductive material to form, can be transparent or opaque, shielding construction and aforesaid busbar structure (as the first bus and the second bus) expose mutually, and wherein shielding construction is provided direct current signal.See into capacitive touch screen by insulation top layer, only have few part overlapping between shielding construction with busbar structure, and shielding construction and busbar structure expose between space each other.

In one example of the present invention, when contact range is greater than pre-conditioned, contact range must be covered in shielding construction.In another example of the present invention, when contact range is greater than pre-conditioned, the area that contact range is covered in shielding construction is greater than the area being covered in the second bus.In an example more of the present invention, when contact range is greater than pre-conditioned, the area that contact range is covered in the circuit being provided direct current signal is greater than the area being covered in the second bus, and the circuit being wherein provided direct current signal comprises shielding construction and first bus of part.

Please refer to Fig. 6, for the void on the capacitive touch screen of the different shield structure of tool touches effect analysis schematic diagram., on the capacitive touch screen of tool shielding construction, there is capacitive couplings amount Chg1 between the first finger H1 and shielding construction, and and capacitive couplings amount Chg2 occur between second finger H2 and shielding construction in contrast Fig. 2 A.

With impedance/electrovolumetric analysis, be Chg+Cht2+Chg2 at the electric capacity of the second contact region P2 to the circuit being provided direct current signal, the electric capacity of negative tactile signal and the second bus Rx2 is Chr2.Therefore negative ratio GTR=(Chr2)/(Chg+Cht2+Chg2) touching and just touching.The negative tactile ratio GTR with just touching is less, bears the effect touched signal and just touch signal cancellation less.Remove or reduce the negative signal that touches and align tactile caused impact, except reducing area that the second bus exposes, can be increase the area being provided the circuit of direct current signal, make second finger H2 near to or in contact with time, most contact range all cover be provided direct current signal circuit (as shielding construction and the first bus not being provided drive singal) on.

In one example of the present invention, the busbar structure of shielding construction and single layer structure is positioned at same layer.In another example of the present invention, shielding construction and double-deck first bus or the second bus are positioned at same layer, and wherein preferably configuration is upper strata shielding construction being configured at closer insulation top layer.

Please refer to Fig. 7 A, is the shielding construction schematic diagram proposed according to the third embodiment of the present invention, and shielding construction comprises multiple shielding sheet 71 and shielding connecting line 72.Relative to Fig. 3 A, include multiple shielding sheet 71 in opening 35, shielding sheet 71 is provided direct current signal (or ground connection) by shielding connecting line 72 in the mode of serial or parallel connection.

Relative to Fig. 3 A, the shielding construction of the present embodiment comprises the multiple shielding sheets 71 being positioned at described opening 35; And provide this direct current signal to many shielding connecting lines 72 of described shielding sheet 71 with series connection and/or parallel connection.

Please refer to Fig. 7 B, is the shielding construction schematic diagram proposed according to the fourth embodiment of the present invention, and shielding construction comprises multiple shielding sheet 71 and shielding connecting line 72.Relative to Fig. 7 A, in the first bus 31, also comprise multiple opening 35, and also comprise multiple shielding sheet 71 in the opening 35 of the first bus 31.

In Fig. 7 A and Fig. 7 B, bus comprises the conducting strip of multiple rhombus, it can also be other a few conjunction profiles such as quadrilateral, hexagon, octagon that those skilled in the art can know conducting strip by inference, and bus may also be the vertical bar profile without conducting strip in addition.

Please refer to Fig. 7 C, is the shielding construction schematic diagram proposed according to the fifth embodiment of the present invention.First bus 31 both sides have one the 3rd bus 73 respectively, and the second bus 32 both sides have one the 4th bus 74 respectively, and wherein the 3rd bus 73 and the 4th bus 74 form shielding construction.In other words, the first bus 31 and the second bus 32 overlap on multiple crossover region, and the both sides of the first bus 31 and the second bus 32 have a screening conductive article (i.e. the 3rd bus 73 and the 4th bus 74) respectively.In addition, the first bus 31, second bus 32, the 3rd bus 73 and the 4th bus 74 are mutually isolated, and wherein the first bus 31 and the 3rd bus 73 overlap on the second bus 32 and the 4th bus 74.

3rd bus 73 and the 4th bus 74 are the screening conductive article forming shielding construction, and the both sides of each first bus 31 and each a second bus 32 adjacent screening conductive bar respectively.In addition, the gabarit of screening conductive bar and the gabarit of the first adjacent bus 31 or the second bus 32 match.

The first bus in diagram has contact W1, connects wire to control circuit or controller, as aforementioned driving/detecting unit 130, in order to be operatively provided a drive singal.In addition, the second bus has contact W2, connects wire to control circuit or controller, as aforementioned driving/detecting unit 130, in order to provide mutual capacitance coupled signal.In addition, screening conductive bar has contact W3, to connect wire to direct current signal.

Please refer to Fig. 7 D, is the shielding construction schematic diagram proposed according to the sixth embodiment of the present invention.It is mutually overlapping that shielding construction comprises many articles of the 3rd buss 75 and the 4th bus the 76, three bus 75 and the 4th bus 76, and wherein the 3rd bus 75 and the 4th bus 76 can be coupled or isolate in overlapping part.The both sides of the 3rd bus 75 have one first bus 31 respectively, and the both sides of the 4th bus 76 have one second bus 32 respectively, and wherein the first bus 31 and the second bus 32 overlap on multiple crossover region, and mutually isolated.In addition, the busbar structure that forms of the first bus 31 and the second bus 32 and shielding construction mutually isolated.

In other words, the both sides of each screening conductive bar are adjacent one first bus 31 or adjacent one second bus 32 respectively respectively, and wherein the first bus 31 and the gabarit of the second bus 32 and the gabarit of adjacent screening conductive bar match.

Please refer to Fig. 7 E, is the shielding construction schematic diagram proposed according to the seventh embodiment of the present invention.First bus 31 and the second bus 32 overlap on multiple crossover region, and have screening conductive bar 77 between the first bus 31 and the second bus 32, what wherein the multiple opening in screening conductive bar 77 and the gap between screening conductive bar 77 defined the first sliver 31 and the second bus 32 exposes part.In other words, screening conductive bar 77 forms a shielding construction, and the first bus 31, second bus 32 exposes mutually with screening conductive bar 77, and wherein screening conductive bar 77 and one of the first bus 31 and the second bus 31 (under double-decker) or both (under single layer structure) are positioned at same layer.Under double-decker, the advantageous configurations of screening conductive bar 77 is the upper stratas being positioned at closer insulation top layer, wherein upper-layer configured first bus 31.

In other words, described screening conductive bar has multiple opening, one of the first described bus and the second described bus are exposed in gap between wherein said screening conductive bar, and described opening exposes the first described bus and the second described bus another.In a preferable example of the present invention, the first described bus is exposed in the gap between wherein said screening conductive bar, and described opening exposes the second described bus.

In an optimal mode of the present invention, shielding construction and the first described bus are positioned at same layer, the second wherein said bus and the first described bus are positioned at same layer or are positioned at and insulate top layer one deck far away apart from one, and wherein said external conductive object is near to or in contact with in top layer of insulating.

When there is no shielding construction, first bus and the second bus can because drive singal form electric field, when having shielding construction, the some of aforementioned electrostatic field can be shunted the electric field become between the first bus and shielding construction by the shielding construction between the first bus and the second bus, and the electric field between the first bus and the second bus will relatively diminish.

In other words, shielding construction the path providing drive singal to flow to the ground of system by external conductive object is extraly provided, make jointly corresponding to external conductive object near to or in contact with change amount signal increase.Especially, thinner by shielding insulation top layer, then flow to the signal on the ground of system by external conductive object larger for drive singal.

Due to one of source that human body is noise, likely being injected by noise when contacting, causing conductive interference, the potential difference (PD) between the earthing potential of this earthing potential normally at human body and device caused.Such as, conductive interference VA can be to receiving end by body-coupled, the undesired signal that second bus Rx1 receives is Ir=((Chr1)/(Chg1+Chr1+Cht1)) * In, other signal will be poured off by grounding circuit direct current signal circuit, as Ig=((Chg1+Cht1)/(Chg1+Chr1+Cht1)) * In, wherein In is the electric current of conductive interference.If when Chg1 is much larger than Chr1+Cht1 or Chg1 much larger than Chr1, undesired signal Ir will drive and level off to 0.Even if when Chg1 is not much larger than Chr1+Cht1 or Chg1 much larger than Chr1, the anti-ability of noise of being conducted by human body is directly proportional to the size that exposes of shielding construction.Accordingly, adjustable shielding isolated area makes conductive interference significantly reduce.

Suppose between the first bus and the second bus not overlapping, and external conductive object only has impact to the electric field exceeding insulation top layer, insulation top layer provide can reduce insulation top layer not by the basic value (baseline) of the signal near to or in contact with front second bus, relatively allow insulation top layer by external conductive object near to or in contact with time the second bus change amount signal become obvious.

It should be noted that, shielding construction expose area too little or insulation top layer thickness too thick, the capacitive couplings between shielding construction and human body relatively becomes very little, even can ignore.Unique benefit of such design is direct capacitive couplings between isolated first bus and the second bus, make the second bus not by near to or in contact with time the capacitive couplings signal that provides relatively diminish, namely reference value diminishes relatively, change amount signal can be made like this to seem relatively to become large, but change amount signal is very little by the impact of shielding construction in essence, does not even have.Such as, the electric field line between the first bus and shielding construction all or major part all insulating in top layer, belong to and affect very little or impregnable electric field line by external conductive object.

But in technical scheme provided by the invention, the capacitive couplings of shielding construction and external conductive object is greater than the capacitive couplings of the second bus and external conductive object or is greater than the capacitive couplings of conductive structure and external conductive object, therefore except empty touching except effect can be reduced, the noise from external conductive object can also be reduced.Particularly be less than below 0.5mm on insulation top layer, under being even less than 0.3mm, above-mentioned advantage is more obvious.If coordinated again, mutual capacitance sensitive information is converted into continuous print difference or the two difference of continuous print, also can save building of screen layer, not only top layer is thinner to make capacitive touch screen, and backing layer also can be thinner jointly, even makes the integral thickness of capacitive touch screen may at below 0.5mm.

Please refer to Fig. 8, is the method for detecting of the capacitive touch screen according to eighth embodiment of the present invention proposition.First, as shown in step 810, provide the capacitive touch screen with a shielding construction, the busbar structure on shielding construction and capacitive touch screen exposes mutually.Next, as shown in step 820, provide this drive singal at least one first bus continuously simultaneously, and provide a direct current signal to the first bus not being provided this drive singal.In addition, as shown in step 830, the mutual capacitance coupled signal provided according to the second bus when drive singal is provided each time produces a sensitive information, wherein each value of sensitive information is respectively differing from of the signal of a pair second buss or is respectively the difference of signal difference of two pairs of buss in three buss, and the noise that described difference suppresses the conduction of this display.

In the prior art, cause the negative external conductive object touched more, drive singal is flowed into by the capacitive couplings of multiple external conductive object (the first shaping claviform described above and the second shaping claviform) provides the semaphore of the bus of mutual capacitance coupled signal (the second bus described above) larger.When the signals touched when wherein one or more are negative cause the signal just touched to reduce, easily cause the erroneous judgement of just touching position, the quantity of the position of the external conductive object therefore can simultaneously judged, be limited to and just touch signal by the degrees of tolerance born tactile signal and reduce.This problem provide the bus of mutual capacitance coupled signal and external conductive object more close to time more serious.Namely, the thickness of insulation top layer or capacitive touch screen is thinner, and negative tactile effect is more serious.

On the contrary, in technical scheme provided by the invention, above-mentioned second external conductive object is greater than with the capacitive couplings amount of the circuit of the direct current signal that is coupled and provides the amount of the capacitive couplings between the bus of mutual capacitance coupled signal.Particularly, cause the negative external conductive object touched more or insulation top layer is thinner time, above-mentioned second external conductive object is more greater than with the capacitively coupled amount of the circuit of the direct current signal that is coupled and provides the capacitively coupled amount between the bus of mutual capacitance coupled signal, drive singal is flowed into by the capacitive couplings of multiple external conductive object provides the signal of the bus of mutual capacitance coupled signal less, contrary with the defect of prior art.

Please refer to Fig. 9 A, is the structure of a kind of capacitive touch screen according to ninth embodiment of the present invention proposition, comprises many first buss 91, many second buss 92 and at least one shadow zones 93.First bus 91 and the second bus 92 comprise multiple conducting strip 94 respectively, and conducting strip 94 and bus (as the first bus 91 and the second bus 92) form cross or T word structure.In one example of the present invention, the distance between two conducting strips relative on adjacent two buss is about 2.6mm.

In one example of the present invention, each first bus 91 comprises towards many first connecting lines of one first guiding and towards one second many of leading first conducting strip, and described first connecting line connects described first conducting strip.In addition, each second bus 92 comprises towards many second connecting lines of the second guiding and towards the first many of leading second conducting strip, and described second connecting line connects described second conducting strip.In other words, described first bus and the described connecting line of the second bus and the towards the opposite of wire.

Shadow zone 93 defines multiple non-covering space, non-covering space described in conducting strip 94 is positioned at.Bus and shadow zone 93 can be copline (single layer structure (SITO)), completely cut off each other, described many first buss 91 and one of described both many second buss 92 are another and the shadow zones 93 that the mode of building bridge strides across both.In addition, bus and shadow zone 93 can be double-decker (DITO), and wherein shadow zone 93 can be and the first bus 91 or the second bus 92 copline.In one example of the present invention, shadow zone 93 can be independent of the first bus 91 and the second bus 92 outside one deck, can be to be positioned at above the first bus 91 and the second bus 92, middle or below, wherein to be positioned at top the best of the first bus 91 and the second bus 92.In another example of the present invention, first bus 91 is for being provided the bus of drive singal, be positioned at the top of the second bus 92, comparatively the second bus 92 is near contact subject, wherein the second bus 92 is by the bus detected, namely operability is coupled to the bus of circuit for detecting, to provide the image that on the information of contact subject position or capacitive touch screen, mutual capacitance is coupled.

In the present embodiment, be to provide the bus formed with the conducting strip 94 of cross or T word structure, consistent with the vertical and horizontal direction that bus distributes, relative to the conducting strip of diamond structure, when drawing straight line, in the straight line that the coordinate that signal presents is formed, zigzag situation can obviously reduce.Coordinate shadow zone 93 again, under reduction zigzag situation, void can be reduced simultaneously and touch the impact that signal cancellation touches signal in fact, reduce and judge out the situation that void is touched or setting-out is broken by accident.Relative to the bus of conducting strip 94 without cross or T word structure, the capacitive touch screen with the conducting strip 94 of cross or T word structure by less bus quantity, can provide close coordinate precision.

In one example of the present invention, as shown in Figure 9 C, capacitive character touch control sensor more can comprise a screen layer 95, is positioned between capacitive character touch control sensor and display 96 (as liquid crystal display), to shield the noise that display 96 conducts.

Please refer to Figure 10 A to 10C, for the structure of the capacitive touch screen that foundation tenth embodiment of the invention provides, comprise many first buss 101, many second buss 102, many screening conductive bars 103 and 104, with the shielded conductor 105 and 106 being connected screening conductive bar 103 and 104, wherein each screening conductive bar 103 and 104 has multiple screening conductive sheet 107 respectively, and the first bus 101 and the mutual multiple crossover region of overlapping formation of the second bus 102.Described screening conductive bar 103 can be that the screening conductive sheet 107 described in many shielding connecting lines are contacted is formed.Aforesaid busbar structure comprises the first described bus 101 and the second described bus 102, and aforesaid busbar structure comprises described screening conductive bar 103 and 104, wherein said screening conductive bar 103 and 104 is provided DC potential by described shielded conductor 105 and 106.

In one example of the present invention, described first bus 101 and the second bus 102 are strip, mutually overlapping and mutually expose, and form the multiple grids (grids) exposing space exposing described screening conductive sheet 107.In the present embodiment, the structure of screening conductive sheet 107 is square, but the structure of screening conductive sheet 107 includes but not limited to round, oval or other a few conjunction structures.In an optimal mode of the present invention, structure and the described space of exposing of described screening conductive sheet 107 match.In another example of the present invention, each exposes space and exposes one or more screening conductive sheet.

Each screening conductive bar 103 and 104 can be shield connecting line multiple screening conductive sheet 107 of contacting by many to form.In one example of the present invention, capacitance type touch control sensor can be only have one of described both screening conductive bars 103 and 104.In another example of the present invention, capacitance type touch control sensor can be have described screening conductive bar 103 and 104, and the screening conductive sheet 107 of wherein said screening conductive bar 103 and 104 is stacked between two.

Please refer to Figure 10 D and Figure 10 E, the size of the distance between bus and screening conductive sheet is less than effective contact range of contact subject, wherein effectively contact range refers to the scope enough producing effectively real tactile signal, but effectively contact range may vary with each individual, therefore can be with effective contact range of preset value definition.In one example of the present invention, effective contact range at least can cover a crossover region and a screening conductive sheet simultaneously.

The preferable example of the present embodiment is applied to double-decker, comprises upper strata and lower floor, the first described bus or be positioned at upper strata by driving bus, and the second described bus is positioned at lower floor, and upper strata and lower interlayer are that the intermediary layer that insulate is separated.In other words, the first described bus and the second described bus intermediary layer that insulated is separated in different layers.In one example of the present invention, shielding construction comprises many upper strata screening conductive bars and many underlying shield buss, described Upper conductive bar is adjacent at same layer with the first described bus, and described underlying conductive bar is adjacent at same layer with the second described bus.In another example of the present invention, the first described screening conductive bar and the screening conductive sheet consistency from top to bottom of described secondary shielding bus are stacked.In an example more of the present invention, shielding construction comprises many screening conductive bars, and adjacent at same layer with the first bus.That is screening conductive bar is only positioned at one deck.In like manner, screening conductive bar also can be adjacent at same layer with the second bus.

In another example of the present invention, it is the signal according to many buss continuously, difference or the difference signal of bus adjacent are between two provided by circuit for detecting, by the signal subtraction of bus adjacent between two, the noise of most display that disappears mutually conduction, to provide an image of mutual capacitance coupling on the position of contact subject or capacitive touch screen.Circuit for detecting can be the signal simultaneously obtaining whole second bus, or segmentation obtains the signal of whole second bus, in a preferable example of the present invention, simultaneously the signal of all second buss obtains, such as obtained by sample-and-hold circuit simultaneously, so can ensure that the noise disappeared mutually is simultaneous noise, the interference of noise is down to minimum.Therefore, even if do not possess screen layer, the noise from display still can be resisted.

In an example more of the present invention, be the signal according to many buss continuously, provide two differences or two difference signal by circuit for detecting, the noise of most display that disappears mutually conduction.Two difference or two difference signal can be deducted difference or the difference signal of an adjacent bus signal by the signal of each bus, then deduct an adjacent difference or difference signal produced.At capacitive touch screen because when contact produces deformation, the distance of each second bus range display may change because of pressurized, and then the noise causing each second bus to be subject to from display is also inconsistent, two difference or two difference signal, except the noise of most display conduction that can disappear mutually, can also disappear further mutually because the distance of each second bus range display changes the noise variance caused.

Direct current signal and drive singal can be provided by aforesaid controller, and controller can be according to the sternly raw sensitive information of mutual capacitance coupled signal that the second described bus provides when this drive singal is provided each time.Accordingly, capacitive touch screen and controller form a capacitive touch device.

The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when the method and technology contents that can utilize above-mentioned announcement are made a little change or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims

1. a method for detecting for capacitive touch screen, is characterized in that, comprising:

There is provided a capacitive touch screen, this capacitive touch screen comprises:

Have the busbar structure comprising many buss mutually exposed, this busbar structure comprises:

Many the first buss of a drive singal are operatively provided when detecting for mutual capacitance type; With

Many the second buss of mutual capacitance coupled signal are provided, many described the first buss mutually expose with many described the second buss and are separated, and many wherein said the first buss become to expose multiple grid exposing space with many described the second buss are overlapping;

One shielding construction, comprise many screening conductive bars, each screening conductive bar comprises multiple screening conductive sheets of many shielding connecting lines series windings, and wherein each exposes space and exposes at least one screening conductive sheet, wherein this screening conductive sheet be not more than that it exposes this expose space; And

There is provided this drive singal at least one first bus continuously simultaneously, and provide a direct current signal to not being provided the first bus of this drive singal and described shielding construction; And

The mutual capacitance coupled signal provided according to the second described bus when this drive singal is provided each time produces a sensitive information.

2. the method for detecting of capacitive touch screen according to claim 1, it is characterized in that wherein said busbar structure facilitate the contact range of each external conductive object to this capacitive touch screen be greater than one pre-conditioned time, each contact range be covered in this shielding construction expose area be greater than be covered in the second described bus expose area or be greater than be covered in described busbar structure expose area, or each contact range be covered in this shielding construction and the first described bus expose area be greater than be covered in the second described bus expose area, thus make the ratio of second bus of this drive singal after the first bus described at least one first external conductive object outflow in described external conductive object again described at least one second external conductive object in described external conductive object flows into, quantity along with the second described external conductive object increases and reduces.

3. the method for detecting of capacitive touch screen according to claim 1, it is characterized in that wherein this shielding construction to comprise many upper strata screening conductive bars adjacent at same layer with many underlying shield buss, the first wherein said bus is adjacent with described upper strata screening conductive bar, and the second described bus is adjacent at same layer with described underlying shield bus.

4. the method for detecting of capacitive touch screen according to claim 1, it is characterized in that wherein this shielding construction comprises many screening conductive bars, one of the first described bus and the second described bus are adjacent at same layer with described screening conductive bar, and the first wherein said bus and the second described bus are separated in different layers with the intermediary layer that insulate.

5. the method for detecting of capacitive touch screen according to claim 4, it is characterized in that wherein this shielding construction and the first described bus are positioned at same layer, the second wherein said bus and the first described bus are positioned at same layer or are positioned at and to insulate top layer one deck far away apart from one, and wherein an external conductive object is near to or in contact with in this insulation top layer.

6. the method for detecting of capacitive touch screen according to claim 1, is characterized in that the capacitive couplings of wherein each external conductive object and the second described bus is less than and the capacitive couplings of this shielding construction or the capacitive couplings that is less than with this shielding construction and the first described bus.

7. the method for detecting of capacitive touch screen according to claim 2, it is characterized in that wherein this is pre-conditioned is a width or an area, and the area that the first described bus exposes is greater than the area that the second described bus exposes.

8. the method for detecting of capacitive touch screen according to claim 2, it is characterized in that the wherein ratio that be provided first bus of this direct current signal of this drive singal after the first bus described at least one first external conductive object outflow in described external conductive object again described at least one second external conductive object in described external conductive object flows into, the quantity along with the second described external conductive object increases and increases.

9. the method for detecting of capacitive touch screen according to claim 2, it is characterized in that each value of wherein this sensitive information is respectively differing from of the signal of a pair second buss or is respectively the difference of signal difference of two pairs of buss in three buss, and in the difference of the signal of a pair described second buss and described three buss, poor suppression one display of the signal difference of two pairs of buss conducts the noise come.

10. the method for detecting of capacitive touch screen according to claim 9, it is characterized in that the surrounding of wherein this capacitive touch screen is fixed in a display, the part that capacitive touch screen is not fixed in this display produces deformation with pressure, and wherein each value of this sensitive information produces according to the difference of the signal difference of front two buss in three buss and the signal difference of rear two buss respectively.

11. 1 kinds of capacitive touch screens, is characterized in that comprising:

One shielding construction, comprise many screening conductive bars, each screening conductive bar comprises multiple screening conductive sheets of many shielding connecting line series windings, wherein each exposes space and exposes at least one screening conductive sheet, wherein this screening conductive sheet be not more than that it exposes this expose space, and this shielding construction is provided a direct current signal;

Wherein, this direct current signal is provided by a controller, this controller provides this drive singal at least one this drive singal of first bus continuously simultaneously, and provide this direct current signal to the first bus not being provided this drive singal, the mutual capacitance coupled signal that wherein this controller provides according to the second described bus when this drive singal is provided each time produces a sensitive information.

12. capacitive touch screens according to claim 11, it is characterized in that wherein said busbar structure facilitate the contact range of each external conductive object to this capacitive touch screen be greater than one pre-conditioned time, each contact range be covered in this shielding construction expose area be greater than be covered in the second described bus expose area or be greater than be covered in described busbar structure expose area, or each contact range be covered in this shielding construction and the first described bus expose area be greater than be covered in the second described bus expose area, thus make the ratio of second bus of this drive singal after the first bus described at least one first external conductive object outflow in described external conductive object again described at least one second external conductive object in described external conductive object flows into, quantity along with the second described external conductive object increases and reduces.

13. capacitive touch screens according to claim 11, it is characterized in that wherein this shielding construction to comprise many upper strata screening conductive bars adjacent at same layer with many underlying shield buss, the first wherein said bus is adjacent with described upper strata screening conductive bar, and the second described bus is adjacent at same layer with described underlying shield bus.

14. capacitive touch screens according to claim 11, it is characterized in that wherein this shielding construction comprises many screening conductive bars, one of the first described bus and the second described bus are adjacent at same layer with described screening conductive bar, and the first wherein said bus and the second described bus are separated in different layers with the intermediary layer that insulate.

15. capacitive touch screens according to claim 14, it is characterized in that wherein this shielding construction and the first described bus are positioned at same layer, the second wherein said bus and the first described bus are positioned at same layer or are positioned at and to insulate top layer one deck far away apart from one, and wherein an external conductive object is near to or in contact with in this insulation top layer.

16. capacitive touch screens according to claim 11, is characterized in that the capacitive couplings of wherein each external conductive object and the second described bus is less than and the capacitive couplings of this shielding construction or the capacitive couplings that is less than with this shielding construction and the first described bus.

17. capacitive touch screens according to claim 12, it is characterized in that wherein this is pre-conditioned is a width or an area, and the area that the first described bus exposes is greater than the area that the second described bus exposes.

18. capacitive touch screens according to claim 12, it is characterized in that the wherein ratio that be provided first bus of this direct current signal of this drive singal after the first bus described at least one first external conductive object outflow in described external conductive object again described at least one second external conductive object in described external conductive object flows into, the quantity along with the second described external conductive object increases and increases.

19. capacitive touch screens according to claim 12, it is characterized in that each value of wherein this sensitive information is respectively differing from of the signal of a pair second buss or is respectively the difference of signal difference of two pairs of buss in three buss, and in the difference of the signal of a pair described second buss and described three buss, poor suppression one display of the signal difference of two pairs of buss conducts the noise come.

20. capacitive touch screens according to claim 19, it is characterized in that the surrounding of wherein this capacitive touch screen is fixed in a display, the part that capacitive touch screen is not fixed in this display produces deformation with pressure, and wherein each value of this sensitive information produces according to the difference of the signal difference of front two buss in three buss and the signal difference of rear two buss respectively.